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                    <h2><a id="python_0"></a>python基础</h2> 
<h3><a id="_1"></a>一、软件开发的常识</h3> 
<h4><a id="1_3"></a>1.什么是软件</h4> 
<blockquote> 
 <p>一系列由特定顺序组织起来的计算机数据或者指令</p> 
 <p>常见的软件&#xff1a;</p> 
 <p>​ 系统软件&#xff1a;windows,Linux,mac os, Android, iOS, 华为鸿蒙</p> 
 <p>​ 应用软件&#xff1a;QQ,一系列的播放器&#xff0c;一系列的浏览器等 app</p> 
</blockquote> 
<p>软件: QQ,微信</p> 
<p>操作系统: win10, Mac, Andriod, iOS 等</p> 
<p>硬件: 鼠标,键盘,主板,显示器,CPU,内存条</p> 
<h4><a id="2_23"></a>2.什么是开发</h4> 
<blockquote> 
 <p>开发: 就是制作软件的过程, 软件的出现实现了人与计算机之间的交互</p> 
 <p>和软件的交互方式&#xff1a;</p> 
 <p>​ 图形化界面&#xff1a;通过一些现成的界面完成一些任务</p> 
 <p>​ 命令行方式&#xff1a;在控制台输入一些指令&#xff0c;计算机帮忙完成某件事情</p> 
</blockquote> 
<h4><a id="3DOS_33"></a>3.DOS命令行</h4> 
<pre><code>【掌握】
cd  进入指定目录【文件夹】   change directory
cd ..  退回到上一级目录
cd /   退回到根目录
dir	  列出当前目录下所有的文件夹以及文件
</code></pre> 
<h4><a id="4_43"></a>4.计算机编程语言介绍</h4> 
<p>人类语言: 人与人沟通的语言<br /> 计算机语言: 人与计算机沟通的语言<br /> 计算机的组成:<br /> 1, 硬件&#xff1a; 如鼠标&#xff0c;键盘&#xff0c;显示器&#xff0c;显卡&#xff0c;内存条&#xff0c; 硬盘&#xff0c;主板等计算机设备或部件<br /> 2, 操作系统: 基于硬件&#xff0c;用于管理和运行应用程序&#xff0c;是硬件和软件的桥梁<br /> 3, 软件: 应用程序, 依赖于运行的操作系统</p> 
<p>常见编程语言:<br /> C, C&#43;&#43;, JAVA, PHP, Python, JS,html,css, Go, Object-C, Swift, 易语言。</p> 
<p>C&#xff1a; 底层开发, 面向过程&#xff0c;速度快<br /> C&#43;&#43;&#xff1a; 面向对象&#xff0c;嵌入式&#xff0c;Android底层&#xff0c;做游戏&#xff0c; 跨平台<br /> Java: 后端语言, 开发企业级系统&#xff0c;开发Android<br /> C#: 后端语言&#xff0c; 用于Unity3D游戏&#xff0c;如&#xff1a;王者荣耀<br /> php: 后端语言&#xff0c;号称世界上最好的语言.<br /> Python: 高层语言&#xff0c;简单易学。少儿编程.<br /> OC: 号称世界上最优雅的语言&#xff0c;开发iOS<br /> Swift: 开发iOS, 开源&#xff08;开放源代码&#xff09;<br /> JS: javascript&#xff0c; 前端必备语言<br /> html &#43; css: html:前端的标签&#xff0c;css:样式</p> 
<h3><a id="Python_70"></a>二、Python的概述</h3> 
<h4><a id="1Python_72"></a>1.Python语言</h4> 
<blockquote> 
 <p>Python是一种解释型, 面向对象, 动态数据类型的高级程序设计语言.</p> 
 <p>Python由Guido van Rossum&#xff08;荷兰&#xff09; 于1989年底发明,第一个公开发行版发行于1991年</p> 
</blockquote> 
<h4><a id="2Python_78"></a>2.Python的简介</h4> 
<blockquote> 
 <p>Python是一种解释性语言: 开发过程中没有编译这个环节, 类似于PHP和JS语言, 是脚本语言.</p> 
 <p>Python是初学者的语言: Python对初级程序员而言, 是一种伟大的语言.</p> 
</blockquote> 
<h4><a id="3Python_84"></a>3.为什么学习Python</h4> 
<blockquote> 
 <p>Python语言排行榜, Python的薪资, Python的就业岗位数量, Python发展前景</p> 
 <p>Python应用广泛</p> 
 <p>Python 是最接近AI&#xff08;人工智能&#xff09;的语言</p> 
 <p>Python 是跨平台的【Python程序可以运行在windows、linux&#xff0c;Macos上&#xff0c;例如&#xff1a;在windows上书写的Python程序&#xff0c;可以在linux或者macos上运行】</p> 
</blockquote> 
<h4><a id="4Python_94"></a>4.Python发展史</h4> 
<p>Python的作者&#xff0c;Guido von Rossum&#xff0c;是荷兰人。1982年&#xff0c;Guido从阿姆斯特丹大学(University of Amsterdam)获得了数学和计算机硕士学位。</p> 
<p>1989年&#xff0c;为了打发圣诞节假期&#xff0c;Guido开始写Python语言的编译/解释器&#xff0c; Python来自Guido所挚爱的电视剧Monty Python’s Flying Circus (BBC1960-1970年代播放的室内情景幽默剧&#xff0c;以当时的英国生活为素材)。他希望这个新的语言叫做Python的语言 &#xff08;Python翻译&#xff1a;蟒蛇&#xff09;</p> 
<p>1991年&#xff0c;第一个Python编译器(同时也是解释器)诞生。它是用C语言实现的cpython。从一出生&#xff0c;Python已经具有了&#xff1a;类(class)&#xff0c;函数(function)&#xff0c;异常处理(exception)&#xff0c;包括列表(list)和词典(dictionary)在内的核心数据类型&#xff0c;以及模块(module)为基础的拓展系统。</p> 
<h4><a id="5Python_102"></a>5.Python的优缺点</h4> 
<h5><a id="51_104"></a>5.1优点</h5> 
<blockquote> 
 <p>简单&#xff1a;Python是一种代表简单主义思想的语言</p> 
 <p>易学&#xff1a;就如同你即将看到的一样&#xff0c;Python极其容易上手。前面已经提到了&#xff0c;Python有极其简单的语法</p> 
 <p>高层语言&#xff1a;当你用Python语言编写程序的时候&#xff0c;你无需考虑诸如如何管理你的程序使用的内存一类的底层细节</p> 
 <p>面向对象&#xff1a;Python既支持面向过程的编程也支持面向对象的编程</p> 
 <p>可嵌入性&#xff1a;你可以把Python嵌入你的C/C&#43;&#43;程序&#xff0c;从而向你的程序用户提供脚本功能</p> 
 <p>丰富的库&#xff1a;Python标准库确实很庞大。</p> 
 <p>GUI图形界面</p> 
</blockquote> 
<h5><a id="52_120"></a>5.2缺点</h5> 
<blockquote> 
 <p>强制缩进</p> 
 <p>运行速度相对较慢&#xff0c; 因为是高层语言&#xff0c; 打个比方&#xff1a;C语言1s&#xff0c; Java10s, Python100s, 但是运行时间都会非常快&#xff0c; 比如c语言0.01ms, Python1ms, 网络消耗1s, 那么c语言1.00001秒&#xff0c; Python1.001秒&#xff0c; 所以真正运行程序时相差不大</p> 
 <p>代码不能进行加密【源代码】</p> 
</blockquote> 
<h4><a id="6Python_128"></a>6.Python的应用</h4> 
<blockquote> 
 <p>Python擅长的领域:</p> 
 <p>​ web开发</p> 
 <p>​ 爬虫开发</p> 
 <p>​ 数据分析</p> 
 <p>​ 机器学习</p> 
 <p>​ 人工智能</p> 
</blockquote> 
<h3><a id="_145"></a>三、数据的存储</h3> 
<h4><a id="1_147"></a>1.思考问题</h4> 
<blockquote> 
 <p>1.为什么使用计算机</p> 
 <p>​ 为了存储数据&#xff0c;快速处理数据</p> 
 <p>2.数据存储在计算机的什么位置</p> 
 <p>​ 数据存储在内存&#xff08;缓存/临时存储&#xff09;中, 存在硬盘&#xff08;持久化/永久存储&#xff09;</p> 
 <p>3.计算机如何存储数据的</p> 
 <p>​ 计算机存储数据【数据包括数字&#xff0c;英文&#xff0c;中文&#xff0c;文件等】&#xff0c; 最终是以二进制存储在硬盘或内存中</p> 
</blockquote> 
<h4><a id="2_161"></a>2.内存</h4> 
<h5><a id="21_163"></a>2.1概述</h5> 
<blockquote> 
 <p>内存是计算机的组成部分&#xff0c;作用是与cpu沟通的桥梁&#xff0c;计算机中所有的程序都是在内存中运行</p> 
 <p>内存【Memory】,内存储器&#xff0c;作用暂时存放cpu中的运算数据</p> 
</blockquote> 
<h5><a id="22_169"></a>2.2抽象理解</h5> 
<blockquote> 
 <p>一个开关&#xff0c;有两种状态&#xff0c;打开或者关闭&#xff0c;在计算机中使用0和1表示</p> 
</blockquote> 
<h5><a id="23_173"></a>2.3单位</h5> 
<blockquote> 
 <p>硬盘&#xff1a;1T</p> 
 <p>计算机中表示数据的最小单位&#xff1a;比特 【bit ----b】,又被称为位, 0/1</p> 
 <p>计算机中处理数据的最小单位&#xff1a;字节【Byte ----B】</p> 
 <p>单位换算&#xff1a;1B &#61; 8b【掌握】</p> 
 <p>KB MB GB TB PB EB…DB</p> 
 <p>存储单位 :</p> 
 <p>​ 1byte &#61; 8bit</p> 
 <p>​ 1KB &#61; 1024 byte</p> 
 <p>​ 1MB &#61; 1024KB</p> 
 <p>​ 1GB &#61; 1024MB</p> 
</blockquote> 
<blockquote> 
 <p>计算机在内存中以二进制的形式存储数据【主要使用0和1进行表示】</p> 
</blockquote> 
<h4><a id="3_201"></a>3.进制</h4> 
<h5><a id="31__203"></a>3.1 什么是进制</h5> 
<blockquote> 
 <p>a.进制就是进位的制度&#xff0c;一种进位的方式</p> 
 <p>​ 例如&#xff1a;十进制&#xff1a;逢十进一</p> 
 <p>​ 二进制&#xff1a;逢二进一</p> 
 <p>​ 八进制&#xff0c;</p> 
 <p>​ 十六进制【是由二进制演变来的】</p> 
 <p>b. 常见的进制&#xff1a;</p> 
 <p>​ 二进制&#xff08;0和1&#xff09;: 0, 1</p> 
 <p>​ 十进制&#xff08;0~9的整数&#xff09;: 0,1,2,3,4,5,6,7,8,9</p> 
 <p>​ 八进制&#xff08;0~7的整数&#xff0c;用数字0开头&#xff09;, 0,1,2,3,4,5,6,7</p> 
 <p>​ 十六进制&#xff08;0<sub>9和a</sub>f【不区分大小写】&#xff0c;用0x或者0X开头&#xff09;</p> 
 <p>​ 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f</p> 
</blockquote> 
<h5><a id="32__227"></a>3.2 进制的特点</h5> 
<blockquote> 
 <p>a.每种进制都有确定的符号集</p> 
 <p>b.每种进制采用的是位置表示法&#xff0c;位置不同&#xff0c;表示的意义不同&#xff0c;值的不同取决于它所在位的权值有关</p> 
 <p>​ 举例&#xff1a;</p> 
 <p>​ 注意&#xff1a;下面的^表示的是次方</p> 
 <p>​ 145&#xff1a;100 &#61; 10^2</p> 
 <p>​ 761&#xff1a;1 &#61; 10^0</p> 
 <p>​ 817&#xff1a;10 &#61; 10^1</p> 
 <p>​ 145 &#61; 1x10^2 &#43; 4x10^1 &#43; 5x10^0</p> 
 <p>c.二进制的计算</p> 
 <p>​ 0&#43;0&#61;0</p> 
 <p>​ 1&#43;0&#61;1</p> 
 <p>​ 0&#43;1&#61;1</p> 
 <p>​ 1&#43;1&#61; 10 【逢二进一】</p> 
</blockquote> 
<h5><a id="33___255"></a>3.3 进制之间的转换 【难点】</h5> 
<p>a.二进制 -&gt; 十进制</p> 
<p>​ 转换原理&#xff1a;将二进制按照权展开&#xff0c;相加即可得到十进制</p> 
<p>2的次方:<br /> 2的0次方 &#61; 1<br /> 2的1次方 &#61; 2<br /> 2的2次方 &#61; 4<br /> 2的3次方 &#61; 8<br /> 2的4次方 &#61; 16<br /> 2的5次方 &#61; 32<br /> 2的6次方 &#61; 64<br /> 2的7次方 &#61; 128<br /> 2的8次方 &#61; 256<br /> 2的9次方 &#61; 512<br /> 2的10次方 &#61; 1024</p> 
<p>二进制 &#61;&gt; 十进制<br /> 001 &#61;&gt; 1<br /> 010 &#61;&gt; 2 (1<em>2¹)<br /> 100 &#61;&gt; 4 (1</em>2²)<br /> 1000 &#61;&gt; 8 (1<em>2³)<br /> 10000 &#61;&gt; 16 (1</em>2^4)<br /> …</p> 
<p>000 &#61;&gt; 0<br /> 001 &#61;&gt; 1<br /> 010 &#61;&gt; 2<br /> 011 &#61;&gt; 3<br /> 100 &#61;&gt; 4<br /> 101 &#61;&gt; 5<br /> 110 &#61;&gt; 6<br /> 111 &#61;&gt; 7<br /> …</p> 
<p>二进制 &#61;&gt; 十进制<br /> 101001 &#61;&gt; 2^5 &#43; 2^3 &#43; 1 &#61; 32 &#43; 8 &#43; 1 &#61; 41<br /> 10111 &#61;&gt; 2^4 &#43; 2^2 &#43; 2 &#43; 1 &#61; 16 &#43; 4 &#43; 2 &#43;1 &#61; 23<br /> 101 &#61;&gt; 50<br /> 110 &#61;&gt; 6<br /> 1000 &#61;&gt; 8<br /> 010 &#61;&gt; 2<br /> 111 &#61;&gt; 7<br /> …</p> 
<p>b.十进制 -&gt; 二进制</p> 
<p>​ 转换原理&#xff1a;对十进制进行除2的运算&#xff0c;直到商为0为止&#xff0c;然后将各个步骤中得到的余数倒着写出来.</p> 
<pre><code>方式一: 针对比较小的数

十进制 &#61;&gt; 二进制
41 &#61;&gt; 32 &#43; 8 &#43; 1 &#61; 101001
520 &#61;&gt; 512 &#43; 8 &#61; 1000001000
1314 &#61;&gt; 1024 &#43; 256 &#43; 32 &#43; 2 &#61; 10100100010
3333 &#61;&gt; 2048 &#43; 1024 &#43; 256 &#43; 4 &#43; 1 &#61; 110100000101
66 &#61;&gt; 64 &#43; 2 &#61; 1000010
方式二: 倒除法
41 &#61;&gt; 101001

</code></pre> 
<p>c.二进制 -&gt; 八进制</p> 
<p>​ 转换原理: 每三位二进制按权展开&#xff0c;相加得到1位八进制&#xff0c;实现思路&#xff1a;从右向左进行分组&#xff0c;每3位为一组&#xff0c;不足是补0&#xff0c;将每一组进行二进制转换八进制的操作&#xff0c;最后将每一组得到的结果连起来</p> 
<pre><code>000 &#61;&gt; 0
001 &#61;&gt; 1
010 &#61;&gt; 2
011 &#61;&gt; 3
100 &#61;&gt; 4
101 &#61;&gt; 5
110 &#61;&gt; 6
111 &#61;&gt; 7
二进制     &#61;&gt;  八进制
10100101  &#61;&gt;  010 100 101 &#61;&gt; 245(八进制)
10100100010  &#61;&gt;  10 100 100 010 &#61;&gt; 2442(八进制)

八进制  &#61;&gt; 二进制
245  &#61;&gt; 010 100 101
520  &#61;&gt; 101 010 000
</code></pre> 
<p>d.二进制 -&gt; 十六进制</p> 
<p>​ 转换原理: 每四位二进制按权展开&#xff0c;相加得到1位十六进制&#xff0c;实现思路&#xff1a;从右向左进行分组&#xff0c;每4位为一组&#xff0c;不足是补0&#xff0c;将每一组进行二进制转换十六进制的操作&#xff0c;最后将每一组得到的结果连起来</p> 
<pre><code>0000 &#61;&gt; 0
0001 &#61;&gt; 1
0010 &#61;&gt; 2
0011 &#61;&gt; 3
0100 &#61;&gt; 4
0101 &#61;&gt; 5
0110 &#61;&gt; 6
0111 &#61;&gt; 7
1000 &#61;&gt; 8	
1001 &#61;&gt; 9
1010 &#61;&gt; 10 (A)
1011 &#61;&gt; 11 (B)
1100 &#61;&gt; 12 (C)
1101 &#61;&gt; 13 (D)
1110 &#61;&gt; 14 (E)
1111 &#61;&gt; 15 (F)
# 0 1 2 3 4 5 6 7 8 9 A B C D E F
二进制  &#61;&gt; 十六进制
10100101 &#61;&gt; 1010 0101 &#61;&gt; A5(十六进制)
10100100010 &#61;&gt; 101 0010 0010 &#61;&gt; 522(十六进制)

# 十六进制 &#61;&gt; 二进制
A5 &#61;&gt; 1010 0101
522 &#61;&gt;  0101 0010 0010
</code></pre> 
<p>e.十进制 -&gt; 八进制或者十六进制</p> 
<p>​ 转换原理: 先将十进制转换为二进制&#xff0c;然后再将二进制转换为八进制或者十六进制</p> 
<pre><code>十进制  &#61;&gt; 二进制 &#61;&gt; 十六进制
520   &#61;&gt; 1000001000 (512&#43;8)  &#61;&gt; 10 0000 1000 &#61;&gt; 208(十六进制)

</code></pre> 
<p>f.八进制或者十六进制 -&gt; 十进制</p> 
<p>​ 转换原理: 将八进制或者十六进制按照权展开&#xff0c;相加&#xff0c;类似于二进制转换为十进制</p> 
<pre><code>十六进制 &#61;&gt; 二进制 &#61;&gt; 十进制
522 &#61;&gt; 0101 0010 0010  &#61;&gt; 1024 &#43; 256 &#43; 32 &#43; 2 &#61; 1280&#43;34 &#61; 1314(十进制)
</code></pre> 
<h4><a id="5_396"></a>5.存储数据</h4> 
<blockquote> 
 <p>计算机存储数据的过程:</p> 
 <p>​ 需要先在内存中开辟空间&#xff0c;然后将数据转化成二进制存入内存. 计算机开辟内存空间的最小单位为字节</p> 
 <p>比如存储数字1, 一般会在内存中占4个字节: 00000000 0000000 00000000 00000001</p> 
</blockquote> 
<h3><a id="Python_406"></a>四、第一个Python程序</h3> 
<blockquote> 
 <p>1, 打开Pycharm, 新建项目</p> 
 <p>2, 创建名为hello.py文件 (Python文件以.py后缀结尾)</p> 
 <p>b, 在hello.py中输入以下内容</p> 
 <pre><code class="prism language-python"><span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">&#34;hello world&#34;</span><span class="token punctuation">)</span>
</code></pre> 
 <p>c, 在代码区域右键, 选择’运行’文件</p> 
</blockquote> 
<h3><a id="Python_422"></a>五、Python的编码规范</h3> 
<blockquote> 
 <p>a.在每个语句的后面不用添加分号&#xff0c;每行最好只书写一条语句</p> 
 <p>b.Python中是通过缩进【4个空格】来区分代码块的</p> 
 <p>c.尽量避免在文件名中出现中文和空格</p> 
</blockquote> 
<h3><a id="_432"></a>六、注释</h3> 
<blockquote> 
 <p>注释在编写程序的时候&#xff0c;给代码添加的一些解释性的文字</p> 
 <p>作用&#xff1a;可以提高代码的可读性&#xff0c;以便于以后的参考或者修改</p> 
 <p>注释是解释性文本&#xff0c;在运行程序的时候&#xff0c;会被自动的跳过&#xff0c;不做处理</p> 
 <p>分类<br /> ​ 单行注释&#xff1a;只能注释掉单行的文字 # xxxxxxx</p> 
 <p>​ 多行注释【块注释】&#xff1a;三个单引号或者三个双引号</p> 
 <p>注意&#xff1a;对于多行注释&#xff0c;选用单引号或者双引号都可以</p> 
 <p>​ 如果单纯使用双引号&#xff0c;双引号的注释不能嵌套</p> 
</blockquote> 
<h3><a id="_451"></a>七、输入输出【重点】</h3> 
<h4><a id="1print_453"></a>1.print输出</h4> 
<blockquote> 
 <p>作用&#xff1a;将一些特定的数据输出到屏幕上【调试工具】</p> 
 <p>代码演示&#xff1a;</p> 
 <pre><code class="prism language-python"><span class="token comment">#简单用法:每次只输出一个数据&#xff0c;任何类型都可以</span>
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">)</span>
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">&#34;hello&#34;</span><span class="token punctuation">)</span>

<span class="token comment">#可以通过一条print输出多个数据,使用逗号隔开&#xff0c;最终得到的结果将逗号识别成了空格</span>
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">,</span><span class="token string">&#34;hello&#34;</span><span class="token punctuation">)</span>

x <span class="token operator">&#61;</span> <span class="token number">3</span>
y <span class="token operator">&#61;</span> <span class="token number">4</span>
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">&#34;x &#43; y &#61; &#34;</span><span class="token punctuation">,</span>x <span class="token operator">&#43;</span> y<span class="token punctuation">)</span>
</code></pre> 
</blockquote> 
<h4><a id="2input_472"></a>2.input输入</h4> 
<blockquote> 
 <p>作用&#xff1a;可以将外部的值作为程序中变量的值使用【从控制台获取值】</p> 
 <p>代码演示&#xff1a;</p> 
 <pre><code class="prism language-python"><span class="token comment">#注意&#xff1a;当程序执行到input的时候&#xff0c;程序会停止在这个地方&#xff0c;等待用户的输入&#xff0c;</span>
<span class="token comment"># 当内容输入结束之后&#xff0c;按下enter&#xff0c;此时输入结束</span>
<span class="token comment">#用户输入的值可以通过变量的形式保存起来</span>
s <span class="token operator">&#61;</span> <span class="token builtin">input</span><span class="token punctuation">(</span><span class="token string">&#34;请输入内容&#xff1a;&#34;</span><span class="token punctuation">)</span>
<span class="token keyword">print</span><span class="token punctuation">(</span>s<span class="token punctuation">)</span>

name <span class="token operator">&#61;</span> <span class="token builtin">input</span><span class="token punctuation">(</span><span class="token string">&#34;请输入姓名&#xff1a;&#34;</span><span class="token punctuation">)</span>
age  <span class="token operator">&#61;</span> <span class="token builtin">input</span><span class="token punctuation">(</span><span class="token string">&#34;请输入年龄&#xff1a;&#34;</span><span class="token punctuation">)</span>
<span class="token keyword">print</span><span class="token punctuation">(</span>name<span class="token punctuation">,</span>age<span class="token punctuation">)</span>


<span class="token comment">#需求:根据控制台输入的年龄计算还能活多少年, 假设可以活到100岁</span>
death_age <span class="token operator">&#61;</span> <span class="token number">100</span>

<span class="token comment">#注意&#xff1a;通过input获取的数据全部都是字符串</span>
age1 <span class="token operator">&#61;</span> <span class="token builtin">input</span><span class="token punctuation">(</span><span class="token string">&#34;请输入现在的年龄&#xff1a;&#34;</span><span class="token punctuation">)</span>
<span class="token keyword">print</span><span class="token punctuation">(</span>death_age <span class="token operator">-</span> age1<span class="token punctuation">)</span>


<span class="token comment">#字符串和整型之间的转换</span>
<span class="token triple-quoted-string string">&#34;&#34;&#34;
转换
int()  将字符串转换为整型

int:integer,整型&#xff0c;
str:string,字符串
&#34;&#34;&#34;</span>

<span class="token comment">#修改上面的获取结果的语句</span>
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">&#34;还可以活&#34;</span><span class="token punctuation">,</span>death_age <span class="token operator">-</span> <span class="token builtin">int</span><span class="token punctuation">(</span>age1<span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token string">&#34;年&#34;</span><span class="token punctuation">)</span>


<span class="token comment">#练习&#xff1a;从控制台输入两个数&#xff0c;计算两个数的和&#xff0c;并将结果输出</span>
num1 <span class="token operator">&#61;</span> <span class="token builtin">int</span><span class="token punctuation">(</span><span class="token builtin">input</span><span class="token punctuation">(</span><span class="token string">&#34;请输入第一个数&#xff1a;&#34;</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
num2 <span class="token operator">&#61;</span> <span class="token builtin">int</span><span class="token punctuation">(</span><span class="token builtin">input</span><span class="token punctuation">(</span><span class="token string">&#34;请输入第二个数&#xff1a;&#34;</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">print</span><span class="token punctuation">(</span>num1 <span class="token operator">&#43;</span> num2<span class="token punctuation">)</span>
result <span class="token operator">&#61;</span> num1 <span class="token operator">&#43;</span> num2
<span class="token keyword">print</span><span class="token punctuation">(</span>result<span class="token punctuation">)</span>
</code></pre> 
</blockquote> 
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原书地址：http://www.ituring.com.cn/book/1863（图灵社区）

有关 <em>Python</em>：


&ldquo;人生苦短，我用<em>Python</em>&rdquo;
<em>Python</em>的设计哲学是&ldquo;优雅&rdquo;、&ldquo;明确&rdquo;、&ldquo;简单&rdquo;。




一、<em>基础</em>（变量和字符串）

首先：<em>Python</em> 每个语句结束可以不写分号 ;， 如 print(&#39;hello&#39;) 打印 hello

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				<div class="desc ellipsis-online ellipsis-online-1">用<em>python</em>读写和处理csv文件

读取

这里我们使用pandas包来读取csv文件，pandans处理csv文件十分方便我认为是目前最方便的读取方式 
首先安装pandans



pip install pandans

安装好了之后我们读取一个csv文件 


import pandas as pd                         #导入pandas包
data = pd...</div>
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